图片自动播放和动态添加

 1 <!DOCTYPE html>
 2 <html lang="zh-cn">
 3 <head>
 4     <meta charset="utf-8">
 5     <title>7-66 课堂演示</title>
 6     <link rel="stylesheet" type="text/css" href="style.css">
 7     <style type="text/css">
 8     img{
 9             border-style: groove;
10             border-width: 5px;
11             border-color: orange;
12             display:none;
13         }
14         input[type='button']{
15             width: 60px;
16             height: 60px;
17             border-radius: 30px;
18             outline: none;
19         }
20     </style>
21 </head>
22 <body>
23     <input type="text" id="imgUrl" value=""> <br>
24     <input type="button" value="播放" onclick="autoPlay()">
25     <input type="button" value="添加图片" onclick="addImage()"><br>
26     <img src="" alt=""  height="300" id="img"><br>
27     <script>
28         var imageArr=new Array('../img/sc1.png','../img/sc6.png');
29         var index=0;
30         function autoPlay(){
31             var imgObj=document.getElementById('img');
32             imgObj.style.display='inline';
33             if(imageArr.length<=0){
34                 imgObj.setAttribute('alt','图片木有了，请添加')
35             }else{
36                 index=(index+1)%imageArr.length;
37                 var imgId=imageArr[index]
38                 imgObj.setAttribute('src',imgId)
39             }
40             setTimeout('autoPlay()',1000)
41         }
42 
43         function addImage(){
44             var imgUrl=document.getElementById('imgUrl').value;
45             imageArr.push(imgUrl)
46         }
47     </script>
48 </body>
49 </html>